patch-2.3.48 linux/arch/mips64/lib/watch.S

• Lines: 62
• Date: Thu Feb 24 22:53:35 2000
• Orig file: v2.3.47/linux/arch/mips64/lib/watch.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.47/linux/arch/mips64/lib/watch.S linux/arch/mips64/lib/watch.S
@@ -0,0 +1,61 @@
+/* $Id: watch.S,v 1.2 1999/12/04 03:59:00 ralf Exp $
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Kernel debug stuff to use the Watch registers.
+ * Useful to find stack overflows, dangling pointers etc.
+ *
+ * Copyright (C) 1995, 1996, 1999 by Ralf Baechle
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+
+		.set	noreorder
+/*
+ * Parameter: a0 - logic address to watch
+ *                 Currently only KSEG0 addresses are allowed!
+ *            a1 - set bit #1 to trap on load references
+ *                     bit #0 to trap on store references
+ * Results  : none
+ */
+		LEAF(__watch_set)
+		li	t0,0x80000000
+		subu	a0,t0
+		ori	a0,7
+		xori	a0,7
+		or	a0,a1
+		mtc0	a0,CP0_WATCHLO
+		sw	a0,watch_savelo
+
+		jr	ra
+		 mtc0	zero,CP0_WATCHHI
+		END(__watch_set)
+
+/*
+ * Parameter: none
+ * Results  : none
+ */
+		LEAF(__watch_clear)
+		jr	ra
+		 mtc0	zero,CP0_WATCHLO
+		END(__watch_clear)
+
+/*
+ * Parameter: none
+ * Results  : none
+ */
+		LEAF(__watch_reenable)
+		lw	t0,watch_savelo
+		jr	ra
+		 mtc0	t0,CP0_WATCHLO
+		END(__watch_reenable)
+
+/*
+ * Saved value of the c0_watchlo register for watch_reenable()
+ */
+		.data
+watch_savelo:	.word	0
+		.text